William IV's son Walram (Count from 1278 to 1297) remained a fierce opponent of the Bishopric, supporting Duke John I of Brabant at the 1288 Battle of Worringen against Archbishop Siegfried II of Westerburg.

Walram was succeeded by his younger brother Count Gerhard V who had sided with German king Adolf of Nassau against his rival Albert I of Habsburg.Gerhard managed to retain his territories after Adolf of Nassau lost the Battle of Göllheim in 1298, and in 1314 supported the coronation of Louis IV of Wittelsbach at the nearby City of Aachen, once more against the will of the Cologne bishop.

From 1521 Jülich-Berg and Cleves formed the United Duchies of Jülich-Cleves-Berg[1] in a personal union under Duke John III.

Jülich and Berg fell to Count Palatine Wolfgang William of Neuburg and after the last duke of Palatinate-Neuburg (also Elector of the Palatinate from 1685) Charles III Philip had died without issue in 1742, Count Charles Theodore of Palatinate-Sulzbach (after 1777 also Duke of Bavaria) inherited Jülich and Berg.

In 1794 Revolutionary France occupied the Duchy of Jülich (Duché de Juliers), which became part of the French département of the Roer.

— 1393–1423 in Union with Guelders, from 1423 with Berg, from 1437 with Ravensberg — – from 1521 a part of the United Duchies of Jülich-Cleves-Berg – – in union with Berg and Palatinate-Neuburg, after 1690 also with the Electorate of the Palatinate, from 1777 also with Bavaria– Several cities and municipalities belonged to the Duchy of Jülich: - Jülich • Düren • Münstereifel • Euskirchen • Nideggen • Bergheim • Kaster • Grevenbroich • Mönchengladbach • Dahlen • Dülken • Linnich • Randerath • Brüggen • Süchteln • Aldenhoven • Heimbach • Monschau • Wassenberg • Heinsberg • Gangelt • Geilenkirchen • Waldfeucht • Sittard • Susteren • Sinzig • Tegelen • Remagen.